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NAEP Analysis and Scaling → Estimation of Population and Student Group Distributions → Examining the Population-Structure Models Used in NAEP → Proportion of Scale Score Variance Accounted for by the Population-Structure Models → Proportion of Scale Score Variance Accounted for by the Population-Structure Models, Grade 8 Reading Combined National and State Assessment, by Jurisdiction: 2003
NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure models, by jurisdiction, grade 8 reading combined national and state assessment: 2003
Jurisdiction Number of principal components Proportion1 of scale score variance
Reading for
literary experience		 Reading to
gain information		 Reading to
perform a task
Alabama 235 0.63 0.68 0.72
Alaska 83 0.35 0.39 0.41
Arizona 256 0.67 0.67 0.72
Arkansas 251 0.66 0.65 0.74
California 298 0.62 0.64 0.71
Colorado 253 0.64 0.61 0.71
Connecticut 262 0.63 0.65 0.73
Delaware 219 0.59 0.63 0.69
Florida 254 0.62 0.59 0.74
Georgia 258 0.61 0.61 0.66
Hawaii 278 0.66 0.62 0.73
Idaho 240 0.59 0.64 0.72
Illinois 273 0.56 0.58 0.69
Indiana 240 0.57 0.63 0.68
Iowa 243 0.59 0.57 0.67
Kansas 253 0.58 0.55 0.66
Kentucky 241 0.56 0.59 0.61
Louisiana 244 0.67 0.60 0.68
Maine 241 0.57 0.56 0.67
Maryland 249 0.59 0.61 0.71
Massachusetts 263 0.63 0.64 0.74
Michigan 245 0.57 0.61 0.69
Minnesota 235 0.59 0.63 0.67
Mississippi 234 0.56 0.57 0.64
Missouri 246 0.62 0.55 0.68
Montana 238 0.57 0.61 0.66
Nebraska 247 0.59 0.59 0.67
Nevada 246 0.60 0.64 0.70
New Hampshire 233 0.56 0.63 0.63
New Jersey 260 0.66 0.63 0.75
New Mexico 267 0.62 0.66 0.69
New York 272 0.61 0.67 0.75
North Carolina 259 0.54 0.58 0.63
North Dakota 231 0.63 0.63 0.69
Ohio 246 0.61 0.60 0.70
Oklahoma 266 0.58 0.64 0.66
Oregon 263 0.61 0.57 0.66
Pennsylvania 251 0.64 0.61 0.67
Rhode Island 238 0.63 0.61 0.72
South Carolina 245 0.59 0.60 0.63
South Dakota 227 0.60 0.57 0.66
Tennessee 238 0.56 0.56 0.65
Texas 263 0.58 0.62 0.65
Utah 242 0.62 0.58 0.74
Vermont 226 0.59 0.57 0.66
Virginia 262 0.61 0.61 0.68
Washington 270 0.58 0.61 0.66
West Virginia 230 0.54 0.55 0.61
Wisconsin 249 0.67 0.65 0.73
Wyoming 231 0.56 0.59 0.64
Other jurisdictions
American Samoa 141 0.98 0.87 0.96
District of Columbia 196 0.70 0.71 0.65
DDESS2 171 0.94 0.94 0.97
DoDDS3 199 0.53 0.55 0.54
Virgin Islands 132 0.95 0.81 0.93
1 (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of both sampling and measurement error variance.
2 Department of Defense Domestic Dependent Elementary and Secondary Schools.
3 Department of Defense Dependents Schools (Overseas).
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2003 Reading Assessment.
Last updated 13 February 2009 (GF)

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